<!doctype html>
<html lang="zn-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
    <style>
        div{
            padding:5px;
            text-align: center;
            background-color: #ece023;
            border: 1px solid #000;
        }
        #content{
            padding:50px;
            display: none;
        }
    </style>
</head>
<body>
<div id="slideshow">出现</div>
<div id="slideup">隐藏</div>
<div id="slidetoggle">toggle</div>
<div id="content">hello world</div>
<script src="js/demo3.js"></script>
</body>
</html>